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Half-Discrete Hilbert-Type InequalitiesIn 1934, G. H. Hardy et al. published a book entitled "Inequalities", in which a few theorems about Hilbert type inequalities with homogeneous kernels of degree one were considered. Since then, the theory of Hilbert type discrete and integral inequalities is almost built by Prof. Bicheng Yang in their four published books. This monograph deals with half discrete Hilbert type inequalities. By means of building the theory of discrete and integral
In 1934, G. H. Hardy et al. published a book entitled "Inequalities", in which a few theorems about Hilbert-type inequalities with homogeneous kernels of degree-one were considered. Since then, the theory of Hilbert-type discrete and integral inequalities is almost built by Prof. Bicheng Yang in their four published books.This monograph deals with half-discrete Hilbert-type inequalities. By means of building the theory of discrete and integral Hilbert-type inequalities, and applying the technique of Real Analysis and Summation Theory, some kinds of half-discrete Hilbert-type inequalities with the general homogeneous kernels and non-homogeneous kernels are built. The relating best possible constant factors are all obtained and proved. The equivalent forms, operator expressions and some kinds of reverses with the best constant factors are given. We also consider some multi-dimensional extensions and two kinds of multiple inequalities with parameters and variables, which are some extensions of the two-dimensional cases. As applications, a large number of examples with particular kernels are also discussed.The authors have been successful in applying Hilbert-type discrete and integral inequalities to the topic of half-discrete inequalities. The lemmas and theorems in this book provide an extensive account of these kinds of inequalities and operators. This book can help many readers make good progress in research on Hilbert-type inequalities and their applications.Shipping Notes
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Product Reviews
★★★★★ 4
Cute and comfortable!
Size: 6.5, Color: Chestnut
These are cute and surprisingly comfortable! My arches feel supported and the soles don’t feel as block-like as other platform style sandals!
Things to note:
The footbed liner is not made of suede and is a little slippery. It’s like a neoprene liner which was unexpected for an Ugg shoe.
Also, I only intend to wear these sandals as slides (a la Birkenstocks) so the “adjustable” Velcro strap over the top part of the foot seems useless. It doesn’t snug the top down at all, functionally speaking it is only to wear around the back of the ankle. Maybe this matters to someone thinking they could tighten the top down a bit. The ankle strap is comfortable but could be a bit
longer.
Overall they are a cute option to the platform Birks that are very uncomfortable imo. Love the options to order half sizes. I’m usually a 6 in Ugg boots but ordered my regular shoe size 6.5 and they fit well. My heel would be at the very end of my sandal
if I sized down. True to size. Keeping and will order in another color!
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Reviewed in the United States on May 28, 2025
★★★★★ 5
Comfy
The most comfortable Sandals I own!
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Reviewed in the United States on April 7, 2026
★★★★★ 5
More comfortable than flats!
Size: 8.5, Color: Bay Fog
I love these sandals! They run true to size, and they’re sooo comfortable. I was worried about getting fakes, but these were the real deal. The color is lovely (light purple). The foot bed can get dirty, but I find them to wash up nicely (by hand, not machine). I have purchased two more colors since! So much better than flats!
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Reviewed in the United States on November 9, 2025
★★★★★ 5
Comfy dual-mode sandals
Cute, quite comfy to walk in and love the support of the heel strap! It is not as comfy if using in slipper mode because the straps don’t keep your foot tight enough. I am usually a 8.5 but it runs slightly small so I switched up to a 9.
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Reviewed in the United States on June 25, 2025
★★★★★ 5
Everything I wanted
Size: 7, Color: Bison Brown
Fantastic! So comfortable and cute. I usually wear a 7.5 or 8 but followed comments and ordered size 7. They fit perfectly.
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Reviewed in the United States on June 8, 2026